The fastest javascript implementation of a double-ended queue. Maintains compatability with deque. 

The fastest javascript implementation of a double-ended queue. Used by the official Redis, MongoDB, MariaDB & MySQL libraries for Node.js and many other libraries. Maintains compatability with deque.

salakar

denque

The fastest javascript implementation of a double-ended queue. Maintains compatability with deque.

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  "description": "The fastest javascript implementation of a double-ended queue. Maintains compatability with deque.",

    "test": "istanbul cover --report lcov _mocha",

    "coveralls": "cat ./coverage/lcov.info | coveralls",

    "benchmark_thousand": "node benchmark/thousand",

    "benchmark_two_million": "node benchmark/two_million"

    "url": "git+https://github.com/Salakar/denque.git"

    "url": "https://github.com/Salakar/denque/issues"

  "homepage": "https://github.com/Salakar/denque#readme",

[![Coverage Status](https://coveralls.io/repos/github/Salakar/denque/badge.svg?branch=master)](https://coveralls.io/github/Salakar/denque?branch=master)

[![build](https://travis-ci.org/Salakar/denque.svg)](https://travis-ci.org/Salakar/denque)

[![npm version](https://img.shields.io/npm/v/denque.svg)](https://www.npmjs.com/package/denque)

[![License](https://img.shields.io/npm/l/denque.svg)](/LICENSE)

Extremely fast and lightweight [double-ended queue](http://en.wikipedia.org/wiki/Double-ended_queue) implementation with zero dependencies.

Double-ended queues can also be used as a:

- [Stack](http://en.wikipedia.org/wiki/Stack_\(abstract_data_type\))

- [Queue](http://en.wikipedia.org/wiki/Queue_\(data_structure\))

This implementation is currently the fastest available, even faster than `double-ended-queue`, see the [benchmarks](#benchmarks)

Every queue operation is done at a constant `O(1)` - including random access from `.peekAt(index)`.

**Requires Node.js 0.10+ - tested on versions 0.10, 0.12, 4, 5 and 6.

- [`new Denque(Array items)`](#new-denquearray-items---denque)

- [`peekAt(int index)`](#peekAtint-index---dynamic)

Creates an empty double-ended queue with initial capacity of 4.

#####`new Denque(Array items)` -> `Denque`

Creates a double-ended queue from `items`.

Push an item to the back of this queue. Returns the amount of items currently in the queue after the operation.

Unshift an item to the front of this queue. Returns the amount of items currently in the queue after the operation.

Pop off the item at the back of this queue.

Note: The item will be removed from the queue. If you simply want to see what's at the back of the queue use [`peekBack()`](#peekback---dynamic) or [`.peekAt(-1)`](#peekAtint-index---dynamic).

If the queue is empty, `undefined` is returned. If you need to differentiate between `undefined` values in the queue and `pop()` return value -

check the queue `.length` before popping.

		{
		"name": "denque",
		"version": "1.1.0",
		"version": "1.1.1",
		"description": "The fastest javascript implementation of a double-ended queue. Maintains compatability with deque.",
		@@ -5,0 +5,0 @@ "main": "index.js",

		@@ -19,3 +19,3 @@ # DENQUE

		**Requires Node.js 0.10+ - tested on versions 0.10, 0.12, 4, 5 and 6.
		Works on all node versions >= v0.10

		@@ -22,0 +22,0 @@ # Quick Start

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